Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3489464 A
Publication typeGrant
Publication dateJan 13, 1970
Filing dateApr 13, 1967
Priority dateApr 16, 1966
Also published asDE1258789B, DE1258789C2
Publication numberUS 3489464 A, US 3489464A, US-A-3489464, US3489464 A, US3489464A
InventorsHans-Jurgen Claus Heinri Delfs
Original AssigneeFuller Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Fluidizing discharge apparatus for removal of fluidized material from a conveying system
US 3489464 A
Images(1)
Previous page
Next page
Description  (OCR text may contain errors)

13, 1970 HANS'JURGEN c. DELFS' 3,489,464

FLUIDIZING DISCHARGE APPARATUS FOR REMOVAL OF FLUIDIZED MATERIAL FROM A CONVEYING SYSTEM Filed April 13, 1967 IN VEN TOR. fin/5 /l//?6N mas nanny m5,

United States Patent O P 39,217 Int. Cl. B65g 53/04, 53/4 US. Cl. 302-29 6 Claims ABSTRACT OF THE DISCLOSURE A fluidizing discharge apparatus on a vacuum conveying system having means for establishing a pressure seal of materialbetween the conveying system and the material outlet of the dischargeapparatus.

BACKGROUND OF THE INVENTION For easy-pouring bulk pulver'ulent material which is conveyed pneumatically in a vacuum conveying system, it is known in the prior art to construct a discharge apparatus for removing material-from the conveying system wherein a column of material in the discharge apparatus is used as a sealing means between the negative pressure in the conveying system and the atmospheric pressure at the material discharge outlet of the apparatus.

Such an apparatus has proved practical for the removal of readily flowable"m'ate'rials, such as grain. However, for fiuidizable materialssuch as .flour,. raw cement, -etc., which do not flow readily by gravity but tend to bridge over the discharge outlet, this type of discharge apparatus has not been found to be satisfactory.

For such fiuidizable materials, it isrequired that some means be provided in the vicinity of the discharge outlet to fluidize the material in order to prevent the abovementioned bridging efiect. One means of accomplishing this is by introducing a pressurized gas into the material to eifect the necessary fluidization.

It can be appreciated that this fluidizing gas must be prevented from discharging into the vacuum conveying system and interrupting the negative pressure of the conveying system.

This has been accomplished previously by the use of various means, such as a discharge chamber containing multi-cells wherein the individual cells may be cmpletely isolated from the conveying system; a pendulm flap valve which is arranged to close the conveying system due to the eifect of the back pressure in the discharge apparatus; and a discharge receptacle which is alternately filled and emptied while the conveying system is started and stopped, respectively. Such units display the disadvantage of rapid wear and/or the necessity of intermittent operation.

SUMMARY OF THE INVENTION This invention relates to a fluidizing discharge apparatus which removes fluidized material from a vacuum conveying system and comprises a single receptacle. A gas and material inlet is located in the upper portion of the receptacle for receiving material from the vacuum conveying system. Also arranged in the upper portion of the receptacle is a gas outlet situated for discharging the conveying gas from the receptacle. The lower portion of the receptacle carries a material outlet and a means for supplying fluidized gas to the material located in the lower portion of the receptacle. Still further, this discharge apparatus is provided with a means for maintaining a pressure seal of material within the receptacle between the gas and material inlet and the material outlet.

ice

Previously, such an apparatus, which utilized a column of material as a sealing means, was considered to be impractical for use in'conjunction with fluidizing units; however, contrary to this belief, it was surprising to find in practical experiments that a material column could be fluidized in its lower region suificiently to facilitate the discharge of material while, at the same time, the upper column of material could be maintained in a dense state sufficient to provide a pressure seal of material.

It is readily apparent that this invention overcomes the aforementioned disadvantages of the prior art by utilizing a simplified technique.

BRIEF DESCRIPTION OF THE DRAWING The figure is a schematic sectional view of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT The fluidizing discharge apparatus comprises an upright receptacle 1 having a bottom wall 14 sloping downwardly toward a material outlet 8. The receptacle 1 has situated in its upper end a gas and material separator, generally indicated by 2, into which opens a pneumatic conveying line 3 for fiuidizable material. The gas and material separator 2 may be a cyclone separator. The conveyor gas is freed from entrained particles in pluralities of filters 4 and is suctioned off by the blower 6 via line 5. Negative pressure in relation to atmospheric pressure prevails in the gas and material separator 2, and hence also in receptacle 1.

The gas and material separator 2 carries a downwardly extending wall 19 which is positioned opposite the conveying line 3 for deflecting the incoming gas and material toward the bottom of the receptacle 1.

In the receptacle 1 there is contained a material column 7 which discharges through the material outlet 8 and is maintained at a constant level by an appropriate level sensing system. The level sensing system consists of a material level sensing device including a pressure member 9, such as a bubble tube, and a control mechanism 10 communicating with the pressure member 9. Further, a metering valve 11, located in the material outlet 8, is operatively connected to the material level sensing device and is responsive thereto.

The bottom of the receptacle is provided with air activated fluidizing units 12 which are fed by the blower 13. The material is thus fluidized in the lower portion of the inaterial column to facilitate its discharge through the out- In the desired state of operation, only the material in the bottom of the material column 7 is aerated; thus, the fluidizing gas actually does not pass through the entire material column 7. In other words, the quantity of fluidiz ing gas and entering the gas material separator is so small that it does not endanger the negative pressure in the conveying line 3. The material column 7 must be maintained at a predetermined minimum level sufii-cient to provide a dense region of material above the fluidizing material in the lower portion of the column. This dense region of material acts as a pressure seal of material between the negative pressure, prevailing in the gas and material separator 2, and the atmospheric pressure present at the material outlet 8.

To insure the required minimum level of material, the level sensing member 9 is positioned at a predetermined location. As the level of material in the column 7 varies from its predetermined level, the level sensing member 9 transmits a signal to the control mechanism 10 which, in turn, regulates the metering valve 11 to discharge more or less material through the outlet 8 in order to maintain the column at its predetermined level.

Various changes may be made in the details of the invention as described without sacrificing the advantages thereof or departing from the scope of the appended claims.

I claim:

1. A fluidizing discharge apparatus for removal of fluidized material from a vacuum conveying system comprising a single receptacle; a gas and material inlet in the upper portion of the receptacle for receiving material from the vacuum conveying system; a gas outlet in the upper portion of the receptacle for discharging the conveying gas from the receptacle; a material outlet in the lower portion of the receptacle; fluidizing means disposed between the gas and material inlet and the material outlet for supplying a fluidizing gas to the lower portion of the receptacle to fluidize only the lower portion of a material column in the receptacle; and means for maintaining a minimum level of material in the receptacle to provide a dense material zone in the upper portion of the material column to act as a pressure seal of material Within the receptacle between the gas and material inlet and the fluidized lower portion of the material column.

2. The discharging apparatus of claim 1 including a gas and material separator disposed between the gas and material inlet and the gas outlet.

3. The discharge apparatus of claim 2 wherein said gas and material separator comprises a separator having a means to deflect the material entering the receptacle towards the lower portion thereof and a filtering media for separating gas from material.

4. The discharge apparatus of claim 1 wherein said means for maintaining the pressure seal of material comprises a material level sensing device and a material discharge metering valve positioned within the material 6. A fluidizing discharge apparatus for removal of fluidized material from a vacuum conveying" system comprising a single receptaclegja gas and material inlet in the upper portion of the receptacle for receiving material from the vacuum conveying system; a gas outlet in the upper portion of the, receptacle for discharging the conveying gas from the receptacle; a gasand material separator disposed between-the gas and material inlet and the gas outlet, said gas and material separator comprising a separator having a means to deflect a material entering the receptacle downwardly into the receptacle and a filtering media for separating gas from material; a material outlet in the lower portion of the receptacle; fluidizing means disposed between the 'gas and material inlet and the material outlet for supplying a fluidizing gas to the lower portion of the receptacle to fluidize only the lower portion of a material column in the receptacle; and means for maintaining a minimum level of material in the receptacle to provide a dense material zonein the upper portion of the material column to act as a pressure seal of material within the receptacle between the gas and material inlet and the fluidized lower portion of the material column comprising a material level sensing device and a material discharge metering valve positioned within the material outlet, said valve operatively connected and responsive to said level sensing device.

References Cited UNITED STATES PATENTS 2,252,581 8/1941' Saint-Jacques 302-59 2,919,159 12/1959 Lacroix 302- 53 2,946,626 7/ 1960 Atkinson et al 302-59 X 3,069,205 12/1962 McIver et al. 302-17 3,208,799 9/1965 Rivers 302--17 FOREIGN PATENTS 1,178,363 9/1964 Germany. 1,178,364 9/1964 Germany.

376,430 5/ 1964 Switzerland.

ANDRES H. NIELSEN, Primary Examiner U.S. Cl. X.R. 30242, 59

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2252581 *May 16, 1939Aug 12, 1941Camille Saint-Jacques EugeneSelector
US2919159 *Jun 7, 1957Dec 29, 1959Pechiney Prod Chimiques SaPneumatic conveying method and system
US2946626 *May 31, 1957Jul 26, 1960Atkinson Bulk Transp CompanySuction-pressure unloading system
US3069205 *Dec 3, 1959Dec 18, 1962Systems Engineering & Mfg Co IConveying of solids
US3208799 *Aug 16, 1962Sep 28, 1965Donald J RichDry material transfer apparatus
CH376430A * Title not available
DE1178363B *Sep 28, 1960Sep 17, 1964Buehler Ag GebVorrichtung zum Austragen von Schuettgut aus einer unter Saugzug stehenden Foerderanlage
DE1178364B *Feb 7, 1961Sep 17, 1964Heinrich Riffer FaFoerdervorrichtung zum Bilden einer Folge gleich langer, parallel nebeneinanderliegender leisten-foermiger Werkstuecke
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3645582 *Nov 16, 1970Feb 29, 1972Barmag Barmer MaschfProcess and apparatus for feeding solid particles under vacuum
US3899311 *Apr 18, 1973Aug 12, 1975Herbert RappRecovery of powder in an electrostatic powder spraying operation
US4013321 *Nov 21, 1974Mar 22, 1977Vac-U-MaxPneumatically actuated hopper-feeder apparatus
US4127307 *Dec 16, 1977Nov 28, 1978Dundee Cement CompanyAerating barge unloading system
US4156546 *Jul 11, 1977May 29, 1979The Upjohn CompanyMethod and apparatus for feeding powder
US4200412 *Apr 20, 1978Apr 29, 1980Dynamic Air IncorporatedControl for pneumatic conveying system
US4235563 *Mar 19, 1979Nov 25, 1980The Upjohn CompanyMethod and apparatus for feeding powder
US4264243 *Jan 4, 1979Apr 28, 1981Dundee Cement CompanyConstant vacuum barge unloading system
US4273652 *Aug 28, 1979Jun 16, 1981Societe Sofiltra-PoelmanInstallation for filtration of a contaminated fluid
US4548529 *Feb 13, 1984Oct 22, 1985Shell Oil CompanyProcess for transporting particulate material from a low pressure zone to a gas-containing elevated pressure zone
US4701080 *Mar 4, 1985Oct 20, 1987Cyclonaire Bulk Cargo Systems, Inc.Transfer system for dry flowable material
US4797038 *Aug 20, 1986Jan 10, 1989Sames S.A.Powder recovery method and device
US4889452 *Feb 28, 1989Dec 26, 1989The Young Industries, Inc.Vented product pump and air filter arrangement
US5294217 *Jun 11, 1992Mar 15, 1994Wagner International AgApparatus for feeding powder coating apparatus with a powder-air mixture
US8007639 *Jan 17, 2006Aug 30, 2011Fabio Perini S.P.A.System for producing an article made of tissue paper or the like comprising a superabsorbent material
US8157483 *Apr 20, 2005Apr 17, 2012Volkmann GmbhMethod and device for rendering vacuum conveyors inert
US8529160 *Apr 30, 2010Sep 10, 2013Steven Richard AmbrizBulk abrasive hopper
US20100232889 *May 23, 2007Sep 16, 2010Patrick Gerrard SheehanImproved Particulate Handling Apparatus and Method
US20110056964 *Apr 30, 2010Mar 10, 2011Axxiom Manufacturing, Inc.Bulk abrasive hopper
US20110229276 *Sep 29, 2009Sep 22, 2011Thomas EderMethod and apparatus for separating particulate solids from a gas stream
Classifications
U.S. Classification406/28, 406/131, 406/163, 55/341.2, 406/109, 406/171, 55/341.1
International ClassificationB65G53/60, B65G53/00
Cooperative ClassificationB65G2812/1625, B65G53/00, B65G53/60
European ClassificationB65G53/00, B65G53/60
Legal Events
DateCodeEventDescription
Jun 22, 1989ASAssignment
Owner name: FULLER COMPANY, PENNSYLVANIA
Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:SECURITY PACIFIC BUSINESS CREDIT INC.;REEL/FRAME:005251/0122
Effective date: 19881214
Jan 8, 1987ASAssignment
Owner name: SECURITY PACIFIC BUSINESS CREDIT INC., 228 EAST 45
Free format text: SECURITY INTEREST;ASSIGNOR:FULLER COMPANY, A DE CORP;REEL/FRAME:004659/0543
Effective date: 19861231
Owner name: SECURITY PACIFIC BUSINESS CREDIT INC., A CORP OF D
Free format text: SECURITY INTEREST;ASSIGNOR:FULLER COMPANY, A DE CORP;REEL/FRAME:4659/543